Update notes for submitted changes

* README.md: Update year

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+Code-Review+1: Joshua Colp <jcolp@digium.com>
+Code-Review+1: Benjamin Keith Ford <bford@digium.com>
+Code-Review+2: George Joseph <gjoseph@digium.com>
+Verified+2: George Joseph <gjoseph@digium.com>
+Submitted-by: George Joseph <gjoseph@digium.com>
+Submitted-at: Fri, 19 Jul 2019 09:48:27 -0500
+Reviewed-on: https://gerrit.asterisk.org/c/asterisk/+/11526
+Project: asterisk
+Branch: refs/heads/master